Interacting loops и degrees of freedom
Цель: Изучить тему «Interacting loops и degrees of freedom» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
Multiple loops share process. Tank inlet flow control affects level; level controller changes outlet flow, which affects downstream pressure. If two controllers fight over same manipulated variable, oscillations result.
Degrees of freedom analysis helps determine how many independent variables can be controlled. In complex process not every desired output can be independently fixed without enough manipulated variables.
Практическая работа
For vessel with one inlet valve and one outlet valve identify two possible controlled variables. Can level and outlet flow both be independently controlled? Yes if each has separate manipulated valve, but interactions remain. Discuss.
Что нужно запомнить
- Tank inlet flow control affects level; level controller changes outlet flow, which affects downstream pressure.
- If two controllers fight over same manipulated variable, oscillations result.
- Degrees of freedom analysis helps determine how many independent variables can be controlled.
- In complex process not every desired output can be independently fixed without enough manipulated variables.
- For vessel with one inlet valve and one outlet valve identify two possible controlled variables.